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# | ||
# MDEV-26294 Duplicate entries in unique index not detected when | ||
# changing collation with INPLACE algorithm | ||
# | ||
SET NAMES utf8; | ||
CREATE TABLE t1 ( | ||
id INT PRIMARY KEY, | ||
msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_swedish_ci UNIQUE | ||
) ENGINE=INNODB; | ||
INSERT INTO t1 VALUES (1, 'aaa'); | ||
INSERT INTO t1 VALUES (2, 'ååå'); | ||
ALTER TABLE t1 | ||
MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, | ||
ALGORITHM=NOCOPY; | ||
ERROR 0A000: ALGORITHM=NOCOPY is not supported. Reason: Collation change on an indexed column. Try ALGORITHM=COPY | ||
ALTER TABLE t1 DROP INDEX msg, | ||
MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, | ||
ALGORITHM=NOCOPY; | ||
DROP TABLE t1; |
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